According to police reports, the 3 men were trying to cross from the northeast side of Autoroute 10, near Du Quartier station, towards the southwestern side where Quartier Dix30 is located (large shopping and bar/restaurant TOD complex connected to the REM).
According to CBC, this is approximately the location where they crossed - not exactly a walk in the park to scale a 7ft concrete barrier/fence in the middle of a highway. What’s even more baffling is that there is a pedestrian bridge right above, along with another overpass 100m north that is open to both pedestrians and traffic.
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